A pretty cool, in fact rare phenomenon, there are only 11 Einstein Rings found by the Hubble Telescope by 2006. This phenomenon occurs when light from a distant galaxy is bent by another galaxy closer to Earth, causing the light from the more distant galaxy to form a bright 'ring' around the closer galaxy!
In fact, at 2008, the Hubble Space Telescope uncovered a DOUBLE Einstein Ring, where two rings from different galaxies can be seen around one closest galaxy!
http://www.sciencedaily.com/releases/2008/01/080110102319.htm
To find out how Einstein Rings work, and more information on the fact on how Einstein predicted these rings around 70-80 years ahead of our time (hence the term Einstein Rings), check out this site:
http://www.sciencedaily.com/videos/2006/0408-einstein_rings.htm ---> with a short movie
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